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Allow multiple exports of the same module (#3897)

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Previously, when exporting the same module multiple times only the first statement would count and the rest would be discarded by the compiler.

This change allows for multiple exports of the same module e.g.,
```
export project.F1
from project.F1 export foo
```
Multiple exports may however lead to conflicts when combined with hiding names. Added logic in `ImportResolver` to detect such scenarios.

This fixes https://www.pivotaltracker.com/n/projects/2539304/stories/183092447

# Important Notes
Added a bunch of scenarios to simulate pos and neg results.
This commit is contained in:
Hubert Plociniczak 2022-11-23 12:40:59 +01:00 committed by GitHub
parent 580ed74726
commit deb670785c
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GPG Key ID: 4AEE18F83AFDEB23
18 changed files with 251 additions and 49 deletions
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12
CHANGELOG.md
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@ -438,14 +438,15 @@
- [Fix performance of method calls on polyglot arrays][3781]
- [Improved support for static and non-static builtins][3791]
- [Missing foreign language generates proper Enso error][3798]
- [Connecting IGV 4 Enso with Engine sources][3810]
- [Made Vector performance to be on par with Array][3811]
- [Introduced IO Permission Contexts][3828]
- [Accept Array-like object seamlessly in builtins][3817]
- [Initialize Builtins at Native Image build time][3821]
- [Add the `Self` keyword referring to current type][3844]
- [Split Atom suggestion entry to Type and Constructor][3835]
- [Connecting IGV 4 Enso with Engine sources][3810]
- [Add the `Self` keyword referring to current type][3844]
- [Support VCS for projects in Language Server][3851]
- [Support multiple exports of the same module][3897]
[3227]: https://github.com/enso-org/enso/pull/3227
[3248]: https://github.com/enso-org/enso/pull/3248
@ -502,14 +503,15 @@
[3781]: https://github.com/enso-org/enso/pull/3781
[3791]: https://github.com/enso-org/enso/pull/3791
[3798]: https://github.com/enso-org/enso/pull/3798
[3810]: https://github.com/enso-org/enso/pull/3810
[3811]: https://github.com/enso-org/enso/pull/3811
[3828]: https://github.com/enso-org/enso/pull/3828
[3817]: https://github.com/enso-org/enso/pull/3817
[3821]: https://github.com/enso-org/enso/pull/3821
[3844]: https://github.com/enso-org/enso/pull/3844
[3828]: https://github.com/enso-org/enso/pull/3828
[3835]: https://github.com/enso-org/enso/pull/3835
[3810]: https://github.com/enso-org/enso/pull/3810
[3844]: https://github.com/enso-org/enso/pull/3844
[3851]: https://github.com/enso-org/enso/pull/3851
[3897]: https://github.com/enso-org/enso/pull/3897
# Enso 2.0.0-alpha.18 (2021-10-12)

4
build.sbt
View File

@ -2100,8 +2100,8 @@ buildStdLib := Def.inputTaskDyn {
val cmd: String = allStdBits.parsed
val root: File = engineDistributionRoot.value
// Ensure that a complete distribution was built at least once.
// Becasuse of `if` in the sbt task definition and usage of `streams.value` one has to
// delegate to another task defintion (sbt restriction).
// Because of `if` in the sbt task definition and usage of `streams.value` one has to
// delegate to another task definition (sbt restriction).
if ((root / "manifest.yaml").exists) {
pkgStdLibInternal.toTask(cmd)
} else buildEngineDistribution

23
engine/runtime/src/main/scala/org/enso/compiler/Compiler.scala
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@ -105,7 +105,11 @@ class Compiler(
*/
def runImportsResolution(module: Module): List[Module] = {
initialize()
importResolver.mapImports(module)
try {
importResolver.mapImports(module)
} catch {
case e: ImportResolver.HiddenNamesConflict => reportExportConflicts(e)
}
}
/** Processes the provided language sources, registering any bindings in the
@ -368,7 +372,12 @@ class Compiler(
}
private def runImportsAndExportsResolution(module: Module): List[Module] = {
val importedModules = importResolver.mapImports(module)
val importedModules =
try {
importResolver.mapImports(module)
} catch {
case e: ImportResolver.HiddenNamesConflict => reportExportConflicts(e)
}
val requiredModules =
try { new ExportsResolution().run(importedModules) }
@ -818,6 +827,16 @@ class Compiler(
}
}
private def reportExportConflicts(exception: Throwable): Nothing = {
if (context.isStrictErrors) {
context.getOut.println("Compiler encountered errors:")
context.getOut.println(exception.getMessage)
throw new CompilationAbortedException
} else {
throw exception
}
}
/** Report the errors encountered when initializing the package repository.
*
* @param err the package repository error

74
engine/runtime/src/main/scala/org/enso/compiler/data/BindingsMap.scala
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@ -255,46 +255,48 @@ case class BindingsMap(
* as and any further symbol restrictions.
*/
def getDirectlyExportedModules: List[ExportedModule] =
resolvedImports.collect { case ResolvedImport(_, Some(exp), mod) =>
val hidingEnsoProject =
SymbolRestriction.Hiding(Set(Generated.ensoProjectMethodName))
val restriction = if (exp.isAll) {
val definedRestriction = if (exp.onlyNames.isDefined) {
SymbolRestriction.Only(
exp.onlyNames.get
.map(name =>
SymbolRestriction
.AllowedResolution(name.name.toLowerCase, None)
)
.toSet
)
} else if (exp.hiddenNames.isDefined) {
SymbolRestriction.Hiding(
exp.hiddenNames.get.map(_.name.toLowerCase).toSet
resolvedImports.collect { case ResolvedImport(_, exports, mod) =>
exports.map { exp =>
val hidingEnsoProject =
SymbolRestriction.Hiding(Set(Generated.ensoProjectMethodName))
val restriction = if (exp.isAll) {
val definedRestriction = if (exp.onlyNames.isDefined) {
SymbolRestriction.Only(
exp.onlyNames.get
.map(name =>
SymbolRestriction
.AllowedResolution(name.name.toLowerCase, None)
)
.toSet
)
} else if (exp.hiddenNames.isDefined) {
SymbolRestriction.Hiding(
exp.hiddenNames.get.map(_.name.toLowerCase).toSet
)
} else {
SymbolRestriction.All
}
SymbolRestriction.Intersect(
List(hidingEnsoProject, definedRestriction)
)
} else {
SymbolRestriction.All
}
SymbolRestriction.Intersect(
List(hidingEnsoProject, definedRestriction)
)
} else {
SymbolRestriction.Only(
Set(
SymbolRestriction.AllowedResolution(
exp.getSimpleName.name.toLowerCase,
Some(mod)
SymbolRestriction.Only(
Set(
SymbolRestriction.AllowedResolution(
exp.getSimpleName.name.toLowerCase,
Some(mod)
)
)
)
)
}
val rename = if (!exp.isAll) {
Some(exp.getSimpleName.name)
} else {
None
}
ExportedModule(mod, rename, restriction)
}
val rename = if (!exp.isAll) {
Some(exp.getSimpleName.name)
} else {
None
}
ExportedModule(mod, rename, restriction)
}
}.flatten
}
object BindingsMap {
@ -675,7 +677,7 @@ object BindingsMap {
*/
case class ResolvedImport(
importDef: IR.Module.Scope.Import.Module,
exports: Option[IR.Module.Scope.Export.Module],
exports: List[IR.Module.Scope.Export.Module],
target: ImportTarget
) {

96
engine/runtime/src/main/scala/org/enso/compiler/phase/ImportResolver.scala
View File

@ -28,6 +28,7 @@ import scala.collection.mutable
* @param compiler the compiler instance for the compiling context.
*/
class ImportResolver(compiler: Compiler) {
import ImportResolver._
/** Runs the import mapping logic.
*
@ -121,8 +122,65 @@ class ImportResolver(compiler: Compiler) {
): (IR.Module.Scope.Import, Option[BindingsMap.ResolvedImport]) = {
val impName = imp.name.name
val exp = module.exports
.collect { case ex: Export.Module => ex }
.find(_.name.name == impName)
.collect { case ex: Export.Module if ex.name.name == impName => ex }
val fromAllExports = exp.filter(_.isAll)
fromAllExports match {
case _ :: _ :: _ =>
// Detect potential conflicts when importing all and hiding names for the exports of the same module
val unqualifiedImports = fromAllExports.collect {
case e if e.onlyNames.isEmpty => e
}
val qualifiedImports = fromAllExports.collect {
case IR.Module.Scope.Export.Module(
_,
_,
_,
Some(onlyNames),
_,
_,
_,
_,
_
) =>
onlyNames.map(_.name)
}
val importsWithHiddenNames = fromAllExports.collect {
case e @ IR.Module.Scope.Export.Module(
_,
_,
_,
_,
Some(hiddenNames),
_,
_,
_,
_
) =>
(e, hiddenNames)
}
importsWithHiddenNames.foreach { case (e, hidden) =>
val unqualifiedConflicts = unqualifiedImports.filter(_ != e)
if (unqualifiedConflicts.nonEmpty) {
throw HiddenNamesShadowUnqualifiedExport(
e.name.name,
hidden.map(_.name)
)
}
val qualifiedConflicts =
qualifiedImports
.filter(_ != e)
.flatten
.intersect(hidden.map(_.name))
if (qualifiedConflicts.nonEmpty) {
throw HiddenNamesShadowQualifiedExport(
e.name.name,
qualifiedConflicts
)
}
}
case _ =>
}
val libraryName = imp.name.parts match {
case namespace :: name :: _ =>
LibraryName(namespace.name, name.name)
@ -175,3 +233,37 @@ class ImportResolver(compiler: Compiler) {
}
}
}
object ImportResolver {
trait HiddenNamesConflict {
def getMessage(): String
}
private case class HiddenNamesShadowUnqualifiedExport(
name: String,
hiddenNames: List[String]
) extends Exception(
s"""Hidden '${hiddenNames.mkString(",")}' name${if (
hiddenNames.size == 1
) ""
else
"s"} of the export module ${name} conflict${if (hiddenNames.size == 1)
"s"
else
""} with the unqualified export"""
)
with HiddenNamesConflict
private case class HiddenNamesShadowQualifiedExport(
name: String,
conflict: List[String]
) extends Exception(
s"""Hidden '${conflict.mkString(",")}' name${if (conflict.size == 1) ""
else
"s"} of the exported module ${name} conflict${if (conflict.size == 1)
"s"
else
""} with the qualified export"""
)
with HiddenNamesConflict
}

6
engine/runtime/src/test/resources/Test_Multiple_Conflicting_Exports_1/package.yaml Normal file
View File

@ -0,0 +1,6 @@
name: Test_Multiple_Conflicting_Exports_1
license: APLv2
enso-version: default
version: "0.0.1"
author: "Enso Team <contact@enso.org>"
maintainer: "Enso Team <contact@enso.org>"

2
engine/runtime/src/test/resources/Test_Multiple_Conflicting_Exports_1/src/F1.enso Normal file
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@ -0,0 +1,2 @@
foo = 42
bar = "z"

5
engine/runtime/src/test/resources/Test_Multiple_Conflicting_Exports_1/src/F2.enso Normal file
View File

@ -0,0 +1,5 @@
import project.F1
from project.F1 import foo
export project.F1
from project.F1 export foo
from project.F1 export all hiding foo

7
engine/runtime/src/test/resources/Test_Multiple_Conflicting_Exports_1/src/Main.enso Normal file
View File

@ -0,0 +1,7 @@
from Standard.Base import IO
from project.F2 import all
main =
IO.println F1.bar
IO.println foo

6
engine/runtime/src/test/resources/Test_Multiple_Conflicting_Exports_2/package.yaml Normal file
View File

@ -0,0 +1,6 @@
name: Test_Multiple_Conflicting_Exports_2
license: APLv2
enso-version: default
version: "0.0.1"
author: "Enso Team <contact@enso.org>"
maintainer: "Enso Team <contact@enso.org>"

2
engine/runtime/src/test/resources/Test_Multiple_Conflicting_Exports_2/src/F1.enso Normal file
View File

@ -0,0 +1,2 @@
foo = 42
bar = "z"

6
engine/runtime/src/test/resources/Test_Multiple_Conflicting_Exports_2/src/F2.enso Normal file
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@ -0,0 +1,6 @@
import project.F1
from project.F1 import foo
export project.F1
from project.F1 export all
from project.F1 export all hiding bar

7
engine/runtime/src/test/resources/Test_Multiple_Conflicting_Exports_2/src/Main.enso Normal file
View File

@ -0,0 +1,7 @@
from Standard.Base import IO
from project.F2 import all
main =
IO.println F1.bar
IO.println foo

6
engine/runtime/src/test/resources/Test_Multiple_Exports/package.yaml Normal file
View File

@ -0,0 +1,6 @@
name: Test_Multiple_Exports
license: APLv2
enso-version: default
version: "0.0.1"
author: "Enso Team <contact@enso.org>"
maintainer: "Enso Team <contact@enso.org>"

2
engine/runtime/src/test/resources/Test_Multiple_Exports/src/F1.enso Normal file
View File

@ -0,0 +1,2 @@
foo = 42
bar = "z"

4
engine/runtime/src/test/resources/Test_Multiple_Exports/src/F2.enso Normal file
View File

@ -0,0 +1,4 @@
import project.F1
from project.F1 import foo
export project.F1
from project.F1 export foo

7
engine/runtime/src/test/resources/Test_Multiple_Exports/src/Main.enso Normal file
View File

@ -0,0 +1,7 @@
from Standard.Base import IO
from project.F2 import all
main =
IO.println F1.bar
IO.println foo
0

31
engine/runtime/src/test/scala/org/enso/interpreter/test/semantic/ImportsTest.scala
View File

@ -88,14 +88,41 @@ class ImportsTest extends PackageTest {
}
"Compiler" should "detect name conflicts preventing users from importing submodules" in {
the[InterpreterException] thrownBy (evalTestProject(
the[InterpreterException] thrownBy evalTestProject(
"TestSubmodulesNameConflict"
)) should have message "Method `c_mod_method` of C could not be found."
) should have message "Method `c_mod_method` of C could not be found."
val outLines = consumeOut
outLines(2) should include
"Declaration of type C shadows module local.TestSubmodulesNameConflict.A.B.C making it inaccessible via a qualified name."
}
"Compiler" should "accept exports of the same module" in {
evalTestProject("Test_Multiple_Exports") shouldEqual 0
val outLines = consumeOut
outLines(0) shouldEqual "z"
outLines(1) shouldEqual "42"
}
"Compiler" should "reject qualified exports of the same module with conflicting hidden names" in {
the[InterpreterException] thrownBy evalTestProject(
"Test_Multiple_Conflicting_Exports_1"
) should have message "Compilation aborted due to errors."
val outLines = consumeOut
outLines(
1
) shouldEqual "Hidden 'foo' name of the exported module local.Test_Multiple_Conflicting_Exports_1.F1 conflicts with the qualified export"
}
"Compiler" should "reject unqualified exports of the same module with conflicting hidden names" in {
the[InterpreterException] thrownBy evalTestProject(
"Test_Multiple_Conflicting_Exports_2"
) should have message "Compilation aborted due to errors."
val outLines = consumeOut
outLines(
1
) shouldEqual "Hidden 'bar' name of the export module local.Test_Multiple_Conflicting_Exports_2.F1 conflicts with the unqualified export"
}
"Constructors" should "be importable" in {
evalTestProject("Test_Type_Imports").toString shouldEqual "(Some 10)"
}